Spaces commands affect either selected text or the whole document if no text is selected. This submenu can be found under the Modify menu.
Single Space
Use this command to replace groups of multiple adjacent blank spaces to single spaces.
Single Tab
Use this command to replace groups of multiple adjacent blank spaces to single tabs.
Tabs to Spaces (NoteTab Pro only)
Converts tab characters to space characters. The number of characters added depends on the size of the tab.